﻿<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="s实验1.aspx.cs" Inherits="上课实验1.s实验1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
              
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            <br /> <br /> <br />
            <select runat="server"  name="choice1" id="choice1">
                <option value="-1">请选择年份</option>
                <option value="1">2017</option>
                <option value="2">2018</option>
                <option value="3">2019</option>
                <option value="4" itemid="4">2020</option>
                <option value="5">2021</option>
                <option value="6">2022</option>
                </select>
              <br />  <br /> <br />

            <select runat="server" name="choice" id="choice" aria-readonly="False">
                <option value="-1">请选择</option>
                <option value="1">天津</option>
                <option value="2">北京</option>
                </select>
            
            <br />
            
        </div>
        <asp:DropDownList ID="DropDownList2" runat="server" OnSelectedIndexChanged="DropDownList2_SelectedIndexChanged" AutoPostBack="True" AppendDataBoundItems="True" CausesValidation="True">
            <asp:ListItem>请选择地方</asp:ListItem>
            <asp:ListItem>天津</asp:ListItem>
            <asp:ListItem>北京</asp:ListItem>
        </asp:DropDownList><br />
        <asp:DropDownList ID="DropDownList1" runat="server"  AutoPostBack="True" CausesValidation="True">
            <asp:ListItem>请选择你的区</asp:ListItem>
        </asp:DropDownList>
    </form>
</body>
</html>
